The staffer claims that the Senate leadership was going back and forth all weekend on whether to allow this vote. "I think there are probably some people who would prefer not to see a vote on this," the staffer says. "It forces people to take a stand."
I imagine there's a pretty close correlation between those who regularly prattle on about Democrats needing to stand for things and show strong leadership, yadda yadda, and those who aren't too thrilled that they'll have to actually take a stand.
People hate this war and George Bush, I really don't know why some lawmakers are still a couple years behind the polls.